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Old 10-26-2016, 05:10 PM   #1
85supersierra
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Join Date: Dec 2012
Location: Walhalla SC
Posts: 135
differential ID questions

I am trying to identify my rear diff. I know it is a 12 bolt GM truck rear but I am having trouble finding the correct pinion seal for it. The only casting numbers I have found are "GM 86", "3896839", and "F178"
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